Socket for incandescent lamps.



G1. C. KNAUFF.. SOCKET FOR INCANDESCENT LAMPS.

Patented Apr. 16,` 1918.

APPLICATION FILED DEC. 9.1915.

eEonGE c. KNAUI'E, or cIiIcAGo,

ILLINOIS, nssIeNoE 'ro EDMUNDS a JONES conronarrow, OE DETROIT, MICHIGAN,

A CORPORATION 0F NEW YORK.

SOCT FOR INANDESCENT LAMPS.

Specication of Letters Patent.

Patented Apr. 16, 1918.

Application filed December 9, 1915. Serial N o. 65,957.

, pertains to make and use the same.

My invention relates to fittings for incandescent electric lamps, its general objects being to provide simple,cheap and effective means for detachably but 'rmly connecting such a lamp to a' socket, and for afording a simple and irmly held but detachable cover adapted either to disclose or conceal the luminous part of thelamp; also, to provide a construction in which the body of the lantern or lamp-inclosing partei the appliance is made integral with one of the contacting or current-carrying portions of the'appliance and integral with some of' the elements required for interlocking the detachable'appliance in the socket. Also to providemeans for preventing a loosening of the interlocked parts by jarring, but without having these means adapted to Wedge in the socket or to distort the latter out of its normal shape. Further'objects Will appear from the followingspecif'lcation and from the accompanying drawings, in which Figure l is anv elevation of a socket having one embodimentl of my invention attached thereto.

Fig. 2 is an enlarged longitudinal section through the axis of Fig. 1. Figs. 3 and 4 are transyerse sections through Fig. 2 along the lines33 and 1 -1 respectively.

usedv in connection with various forms oflamps and sockets, it is particularly adapted for use in connection with the lamps used on andabout automobiles and is shown in such embodiments in the drawings. Thus,

' in `the irst'four igures, my appliance is shown as used in connection with a dashboard socket 1 and an incandescent lamp 2, bothv of the so-called single pole construction, that is to say, the construction in which one terminal of the circuit is grounded to the metal'socket portions so as to save wiring. In this case, the socket 1 has a cylindrical portion which carries an insulating body 3 supporting avwire terminal 4 metallically connected to a spring-pressed plunger 5 projecting toward the mouth of the socket, which mouth has a iange 6 for securing the socket to a dash-board. Extending rearwardly from the said mouth of the socket, the casing of the latter has diametrically opposite slots 7 each provided at its rear end with a return bend affording a seat "for receiving a projection 8-upon the base of my appliance, each such projection being similar tothe lateral projections 9 upon the base 'of the lamp 2. The latter projections 9 are anchored in similarly shaped slots 10 in a cylindrical inner shell 11 soldered into the outer casing l2 of my appliance, which inner shell has mounted in it an insulating body 13 carrying interconnected Contact elements 14 and 15 contactingrespectively with the plunger 5 and With the axial contact tip a 16 on the base ofthe lamp 2.

The outer casing l2 extends in both 'directions beyond the ends of the cylindrical shell 11 and rearwardly of thev latter is preferably diametrically contracted into a contracted end portion 17 adapted freely to en ter-the bore of the socketl, the projections 8 I being preferablyformed integral with the said contracted end portion 17. Threaded upon the casing 12 adjacent to its said contraction 4is a nut 18 which may be screwed against vthe iange 6 so, as to lock the projections 8 in the said seats of the slots 7, this nut being preferably undercut as shown r in Fig..2 so as to engage the Harige 6 at some distance from the casing 12, thus preventing the nut from wedging in the rounded juncture of the dange With the socket casing and also preventing a distorting ofthe socketvloy sucha wed 'ng 4 The forward end or the casing 12 is en lai-ged considerably indiameter and preferably equipped `with a peripheral iange 19 adapted to conceal the rear end of the cover 2O whichv vI shall describe hereafter, and the part -of the casing 12 extending forwardly of this flange has a slot 21 aiordmv an aperture through which the light of the lamp'2 mayissue. Fitted over this forward part Ico ofggthe casing 12 is acover 22 closed at its 110 forward end and provided with an aperture corresponding to the slot 21, so that when the cover is in one position, these apertures desired position,l 'oreferablv provide boththis cover and adjacent parts of the casing 12 with interlocking formations, as for example, finger 23 entering an indentation 24; in the said casing when the lateral apertures are alined and entering an opposite indentation 25 when the said a ertures are out of aline ment. It will be o vious from Figs. 2 and 4 that this interlocking, will f prevent the' cover from being rotated by the jarring of the vehicle on which the appliance is used, although permitting the cover to be forcibly rotatedand likewise allowing-the cover to be detachedby the application of a suiiicient power to overcome the grip ofthe spring finger in one ofthe. said indentation's. ever, I do not wish to be limited to the use of circumferentially spaced 'indentations as portions of the cover. loclng elements, nor to other details of the construction .herein disclosed, since this construction might be modified. in. many ways without departing vfrom the Vspirit of my invention. For 'example, replaced -by a single peripheral groove 26 l(as in 'prevented 'by the Afriction .of this finger in the said groove. So also, itis to be understood that the pictured embodiments, represen-ting so-called trative ofsome, but by no means of all .of

at one end for holding the-lamp, an outer enlarged at by Aequipping the cover with a spring' y las circuit terminals a substantially cylindri- `the'indentations 24 and 25 might bev "candescent lamp, and a lantern casinghousing said lampl nd electrically connect- Fig. 5) entered by the springv linger4 23, accidental rotation of the cover bemg;

neeaor'e casing `fast upon said shell and entirely housing the latter and extending beyond the latter at both ends, said casin being one endto house the ulb of" the lamp and contracted at its other end.

to a bore equal to and lforming a continuation of the bore of said inner shell, an insulating body housedjointly'by the said continuation parts of both bores, and a contact element extending through the insulating body longitudinally of the said bores for l conveying current to a terminal of the lamp..

2. The combination with a 4socket having j nut threaded upon said casingv and enga-ging said socket .to prevent' a" disengagement of .the said formations.

3. The combination with a socket having as circuit terminals a substantially cylindrical ortion land a contact member disposed axia ly of said cylindrical portion, oir-an in-` ing `one terminal 4hereof with the said socket, said. lantern casing having'in-integral formation a contracted end portion en' tering said cylindrical portion and a laterally apertured, housing .normally incasing the bulb of said flamp,1the saidcontract'ed v uipped with end portion. and socket being' eq relatively interlocking f formations.; and a 9 nut threaded upon said casingand engaging' said socket to .prevent Aadisengagement 4o thesaiol-ormationsf 1 'l 'GEORGEG..AUFF. 

